Wohlleben, P., & Billinghurst, J. (2019). The secret wisdom of nature: Trees, animals, and the extraordinary balance of all living things : stories from science and observation. David Suzuki Institute, Greystone Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Wohlleben, Peter, و Jane Billinghurst. The Secret Wisdom of Nature: Trees, Animals, and the Extraordinary Balance of All Living Things : Stories from Science and Observation. Vancouver ; Berkeley: David Suzuki Institute, Greystone Books, 2019.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Wohlleben, Peter, و Jane Billinghurst. The Secret Wisdom of Nature: Trees, Animals, and the Extraordinary Balance of All Living Things : Stories from Science and Observation. David Suzuki Institute, Greystone Books, 2019.
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